Oryzomys palustris (marsh rice rat) and Microtus pennsylvanicus (meadow vole) cohabit coastal marshes in the mid-Atlantic US. Both were live-trapped for 23 months at two tidal marsh sites in Virginia to assess their demography near the margins of their distributions. In the presence of dense vegetation, population dynamics of the two species were seasonal and positively correlated, with densities declining through the winter. At the more sparsely vegetated site, densities of both species were lower, and densities of M. pennsylvanicus were negatively correlated with those of O. palustris. Patterns of reproduction differed between the species. O. palustris was reproductively most active in summer and least so in winter, whereas female M. pennsylvanicus decreased reproductive activity during summer.
Original Publication Citation
Bloch, C. P., & Rose, R. K. (2005). Population dynamics of Oryzomys palustris and Microtus pennsylvanicus in Vrginia tidal marshes. Northeastern Naturalist, 12(3), 295-306. doi:10.1656/1092-6194(2005)012[0295:pdoopa]2.0.co;2
Bloch, Christopher P. and Rose, Robert K., "Population Dynamics of Oryzomys Palustris and Microtus Pennsylvanicus in Virginia Tidal Marshes" (2005). Biological Sciences Faculty Publications. 163.